Merge pull request #170 from Recmo/feature/no-owner

Prevent contracts from owning Ether, Tokens and other contracts.

test/helpers/ERC23TokenMock.sol

@@ -0,0 +1,33 @@
+pragma solidity ^0.4.8;
+
+
+import '../../contracts/token/BasicToken.sol';
+
+
+contract ERC23ContractInterface {
+  function tokenFallback(address _from, uint _value, bytes _data) external;
+}
+
+contract ERC23TokenMock is BasicToken {
+
+  function ERC23TokenMock(address initialAccount, uint initialBalance) {
+    balances[initialAccount] = initialBalance;
+    totalSupply = initialBalance;
+  }
+
+  // ERC23 compatible transfer function (except the name)
+  function transferERC23(address _to, uint _value, bytes _data)
+    returns (bool success)
+  {
+    transfer(_to, _value);
+    bool is_contract = false;
+    assembly {
+      is_contract := not(iszero(extcodesize(_to)))
+    }
+    if(is_contract) {
+      ERC23ContractInterface receiver = ERC23ContractInterface(_to);
+      receiver.tokenFallback(msg.sender, _value, _data);
+    }
+    return true;
+  }
+}

test/helpers/ForceEther.sol

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+pragma solidity ^0.4.8;
+
+// @title Force Ether into a contract.
+// @notice  even
+// if the contract is not payable.
+// @notice To use, construct the contract with the target as argument.
+// @author Remco Bloemen <remco@neufund.org>
+contract ForceEther  {
+  function ForceEther(address target) payable {
+    // Selfdestruct transfers all Ether to the arget address
+    selfdestruct(target);
+  }
+}

test/helpers/HasNoEtherTest.sol

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+pragma solidity ^0.4.8;
+
+import "../../contracts/ownership/HasNoEther.sol";
+
+contract HasNoEtherTest is HasNoEther {
+
+  // Constructor with explicit payable — should still fail
+  function HasNoEtherTest() payable {
+  }
+
+}

test/helpers/toPromise.js

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+export default func =>
+  (...args) =>
+    new Promise((accept, reject) =>
+      func(...args, (error, data) => error ? reject(error) : accept(data)));